function renameCompanyDescriptionAsBusinessDescription(collection) {
    collection.updateMany({}, {$rename: {"CompanyProfile.CompanyDescription": "CompanyProfile.BusinessDescription"}})
}

var clientDWDB = db.getSiblingDB("ClientDW_A");

renameCompanyDescriptionAsBusinessDescription(clientDWDB.GCOverallCompanySummary);
renameCompanyDescriptionAsBusinessDescription(clientDWDB.GCOverallCompanySummaryExtended);

clientDWDB = db.getSiblingDB("ClientDW_B");

renameCompanyDescriptionAsBusinessDescription(clientDWDB.GCOverallCompanySummary);
renameCompanyDescriptionAsBusinessDescription(clientDWDB.GCOverallCompanySummaryExtended);